Gwenpool delivers some inconvenient truths in The Unbelievable Gwenpool #8, 2016, by Christopher Hastings and Gurihiru.

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Gwenpool delivers some inconvenient truths in The Unbelievable Gwenpool #8, 2016, by Christopher Hastings and Gurihiru.
San Diego Comic-Con—seen in the days when it was small enough to fit in a single hotel—in Iron Man #72, 1975, by Mike Friedrich, George Tuska and Vince Colletta. Special guest on-panel appearances by Roy Thomas, Friedrich, Frank Brunner, etc.
A panel apiece from 1996's Journey Into Mystery #503 and 504, by Tom DeFalco and Deodato Studios (i.e. Mike Deodato and various others)--both metacomics references that add up to Neil Gaiman's "Norse Mythology"! Also notable: the "Barnes & Barnes" bookstore.
Squadron Supreme: New World Order (1999), by Len Kaminski et al.: the Stranger catches the Squadron up to date on what's been happening in the thinly veiled DC universe while they've been away. (Note the references to Crisis on Infinite Earths--"worlds will live, worlds will die," etc.--as well as Zero Hour and general retconning.) The Apparition has to be the Spectre, the Erl King is Swamp Thing... is Master Alternity Dr. Fate? In any case, this is the former Nth Man, a.k.a. Thomas Lightner... whose origins can only be alluded to vaguely, since he first appeared in an issue of Marvel Two-In-One that was a team-up with Doc Savage... and he now appears to be playing the Phantom Stranger's role.
Robbie Robertson describes what it's like to work at the Daily Bugle. From 2011's Wolverine #19, by Jason Aaron, Ron Garney and Jason Keith.
Sensational She-Hulk #50, 1993, features a bunch of well-known cartoonists doing rather pointed self-parodies. This page is Howard Chaykin riffing on the opening page of his Black Kiss #1...
Karen Berger--then a little-known DC editor--macks on Captain America, and Tigra reads Zap Comix (I'm going to say #4, though it seems more like an evocation of R. Crumb's "Keep On Truckin'" guy), in Captain America #267, 1982, by J.M. DeMatteis, Mike Zeck and John Beatty.